Hydraulic elevator.



l. B. RITTER.

HYDRAULIC ELEVATOR.

APPLICATION FILED APR. 10, I917 '1,261,624=. Patented Apr. 2,1918.

5 SHEETS-SHEET I.

Witnesses Ifiventor:

. Isaac 13. Bitter W liy his flflvrrwy I. B. RITTER.

HYDRAULIC ELEVATOR.

APPLICATION FILED APR. 10. 1911.

1 ,26 1 624. Patented- Apr. 2, 1918.

5 SHEETS-SHEET 3- +0 Fla. 5'.

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l. B. RITTER'.

HYDRAULIC ELEVATOR.

APPLICATION FILED APR-10,13l7.

1,261,624. Patented Apr. 2,1918.

5 SHEETS-SHEET 4.

FIG/.4.

l. B. BITTER.

HYDRAULIC ELEVATOR.

APPLICATION FILED APR. 10. I911.

1,261,624. Patented Apr. 2,1918.

5 SHEETS-SHEET 5- IIIIIE ll IIIIIHH j mcci csccacci Witnesses I nvenfiar 7h. W j, 180M015. Bitter 1511 12/12:: fltorne W TED SATES PATEV onnron.

ISAAC IB. BITTER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 Q'IIS ELEVATOR COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

arm-mono ELEVATOR.

Specification of Letters Patent.

Patented Apr. 2, 1918.

To all whom it may concern:

Be it known that I, ISAAC B. BITTER, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania have invented certain new and useful Improvements in Hydraulic Elevators, of which the followingis a specification.

My invention relates to improvements in elevators of the type known as hydraulic elevators and particularly relates to improvements in an automatic device for bringing hydraulic elevator cars to the floor level, for which Letters Patent of the United States were granted to me on the twelfth day of January, 1909, No. 909,675.

My invention as generally stated consists in the employment, in addition to the main operating valve, of an auxiliary valve to increase or diminish the pressure in the plunger cylinder and means for automatically operating the said auxiliary valve, together with various novel features of construction and arrangements of parts which will be hereinafter fully described and claimed.

The object of my present invention is to simplify the construction and operation of the several parts of the device and reduce the cost of manufacture and a further object of my invention is to so arrange the mechanism for operating the elevator that the latter will be uickly and effectively brought to the floor evel.

Referring to the drawings: Figure 1, is a diagrammatic view of the elevator car operated by a plunger and illustrating the mechanism employed in carrying out my invention, showing the parts in the position which they assume when the elevator is at rest at the floor level; Fig. 2, is a view in elevation, drawn on a larger scale, showing the preliminary valve, the cam actuating device and the auxiliary valve in section with the parts in the position which they assume when the car is running: Fig. 3, 1s a view similar to Fig. 2, showmg the parts in the position which they assume when the car is below the floor level, when the controlling valve is closed; Fig. 4, is a view similar to Fig. 2, showing the parts in the position which they assume when the car is above the floor level, when the controlling valve is closed; Fig. 5, is a vertical transverse section on line 5-5 Fig. 3; Fig. 6, is a vertical transverse section on line 6-6 Fig. 3;

which enters the plunger cylinder 3.

brought to the floor level.

and Fig. 7, is a horizontal section on line 7-7 Fig. 3.

In the drawings in which like reference characters refer to like parts, 1 represents the elevator car operated by the plunger 2, The car 1 is counter-balanced by the cable 4 runnlng over the sheaves 5 and 6, at the top of the elevator shaft, and carrying the counter-balance weight 7. The plunger 2 is controlled by the controlling valve 10, which is connected with the plunger cylinder 3, by

the to-and-from pipe 12, and said controlllng valve 10 is also connected by pipes 13 and 14 with the high pressure and exhaust tanks respectively, not shown on the drawmg-s.

A controlling cable 15 extending from the car 1 is connected with the ilot valve 16, which in turn controls the piston 17 of the controlling valve 10. The above described means is now generally employed for raising and lowering the elevator car.

In carrying out my invention I employ an auxlhary valve 20, connected with the plunger cylinder or with the above mentioned toand-from pipe 12, from the controlling valve 10. By the action of the said auxiliary valve 20, the car will be automatically When the controlling valve 10 is closed and the car is within fourteen inches above the floor level the auxiliary valve 20 will exhaust the water from the plunger cylinder 3 and allow the car to descend until the car reaches the floor level, at which point the auxiliary valve 20 will be automatically closed. If the controllin valve 10 is closed when the car is more t an fourteen inches above the floor level the auxiliary valve 20 will be automatically opened to admit water from the high pressure pipe 21 into the plunger cylinder 3 and cause the car to rise to the next floor above and said auxiliary valve 20 will then be automatically closed.

If the controlling valve 10 should leak and cause the car to move from the floor level the auxiliary valve 20 will be automatically opened by the car moving one inch in either direction from the floor level and said auxiliary valve will bring the car back to the floor level.

The auxiliary valve 20 is operated in the following manner: A flexible member 22 is attached at one end to the bottom of the car chamber 39, in said cylinder.

and the other end is attached to the bottom of the counter-balance weight 7. The flexible member passes around a sheave 23, loosely mounted upon a shaft 24 located in the elevator shaft below the line of th e car when the latter is in its lowest position. The flexible member 22 also passes around a second sheave 25, mounted on an arm 26 pivotally mounted on the shaft 24, so that said second sheave 25 will take up the slack in the flexible member 22.

The flexible member 22 is provided with projections 28, corresponding in number to the number of floors in the building and said projections 28 are so located upon the flexible member that they will reach a normal point, as shown in Fig. 1, when the car is at a correspondingfloor level, and any movement of the car will move the flexible member andthe projections on. the latter a corresponding distance from the normal point.

When'the car is stopped at the floor level the projection upon the flexible member 22 corresponding to that particular floor Wlll be in the normal position, as shown in Fig. l, and the auxiliary valve 20 will be closed.

The auxiliary'valve 20, is constructed as shown in Fig. 2. A cylinder 30 is provided with a sleeve 31 secured therein and a piston 32 is slidably mounted within the sleeve 31. The piston 32 is provided with collars or heads 33 and 34 upon the ends thereof and between said heads the piston 32 is of smaller diameter than the sleeve 31, thus forming a chamber 35. In the sleeve 31 are formed port holes 36 leading into the annular chamber 37 in the cylinder 30. The chamber 37 is connected with the high pressure pipe 21. The sleeve 31 is also provided with port holes 38 leading into the annular The chamber 39 is connected, by the to-and-from pipe 12, with the plunger cylinder 3. The head 33 of the piston 32 is adapted to close the port holes 38 leading into the chamber 39, communicating with the plunger cylinder 3.

When the piston 32 is moved into the po sition shown in Fig. 3, the water from the high pressure pipe 21 will pass from the chamber 35 through the port holes 38 in the sleeve 31, which will raise the pressure in the plunger cylinder 3 and raise the car. When the piston 32 is moved into the position shown in Fig. 4, the port holes 38 in the sleeve 31 will be again opened and allow the water from the plunger cylinder 3 to flow into the chamber 40 and out through the exhaust pipe 41, reducing the pressure in the plunger cylinder 3, and causing the car to descend.

The head 33 of the piston 32 of the auxiliary valve 20 is of larger area than the head 34, so that the pressure in the chamber 35 will normally force the piston into the position shown in Fig. 3, and the means for aaeneae actuating the piston is only utilized to move the piston in the opposite direction, into the other positions shown in Figs. 2 and 4. A central aperture 42 is formed through the piston 32 to equalize the pressure upon the outer ends of the piston.

The means for operating the piston 32' consists of the actuating device 45, having a'cam member 46, which is engaged by the projections 28 upon the flexible member 22 and said actuating device 45 is controlled by the preliminary valve 55, which is operated by the controlling valve 10. When the controlling valve 10 is closed'to stop the car said controlling valve will move the preliminary valve 55, which in turn will operate the actuating device 45 and move the cam member 46 into the path of the projections 28 upon the flexible member 22.

The actuating device 45 consists of the housing 47 havlng cylinders 48 and 49. A piston 50 having its ends fitting into said cylinders 48 and 49 is'adapted to slide longitudinally in said cylinders. The cylinders 48 and 49 are each arranged so that chambers are formed between the ends of the piston and the cylinder heads. The chamber 51 in the cylinder 48 is connected directly with the high pressure pipe 21. The high pressure normally forces the piston 50 into the position shown in Fig. 2. The opposite end of the piston 50 is of larger area than the end in the cylinder 48, so that when pressure is admitted to the chamber 52 in the cylinder 49, the piston 50 will be forced, against the pressure in the chamber 51, into the position shown in Figs. 1, 3 and 4.

The pressure in the cylinder 49, of the actuating device 45, is controlled by the preliminary Valve 55, hereinafter more fully described. v

The piston 50 of the actuating device is provided with a shaft 56, projecting from either side of the piston, and upon the ends of said shaft 56 are pivotally mounted the plates 57 and 58 forming the'cam member 46. The upper ends of said cam member plates are connected by a cross-bar 59 and said plates are so arranged that they will pass at either side of the sheave 23 carrying the flexible member 22 without touching said sheave or said flexible member, but said plates 57 and 58 will be engaged by the projections 28 upon said flexible members. Said projections 28 extend beyond the line of said sheave and also beyond the plates 57 and 58 of the cam member 46, as shown in Figs. 5 and 6.

Guides 59 and 60 are provided upon the cylinder 49, and said guides extend at either side of the cam member 46 to insure the said cam member moving in a vertical plane.

The plates 57 and 58 of the cam member 46, are continued below the pivot shaft 56 and form arms 62 and 63, connected by a bolt 64, having one end of a connecting-rod 65 pivoted thereon, which latter is held in a central position between the arms 62 and 63 by the sleeves 66, as shown in Figs.

' ed in the bearings 72. An arm 73, rigidly secured on the shaft 71,. is connected with the piston 32 of the auxiliary valve 20, by the connecting rod 74. I

The piston 50, of the actuating device 45,

preliminary valve 55 with the chamber 52 in the cylinder 49, of the actuating device 45. When the piston 87, of the preliminary valve 55, is in the position shown in Fig. 2, the water will be exhausted from the chamber 52, in the actuating device-45 through the pipe 92 and the exhaust pipe 93, of the preliminary valve 55, allowing the high pressure in the cylinder 48 of the actuating device 45 to force the piston 50, of the latter device, into the position shown in Fig. 2.

When the caris running and the piston 87, of the preliminary valve 55, is reversed,

has a lug 76 formed thereon, in which is as shown in Fig. 3, the water from the high pivotally connected one end of a push-rod 77, having at its opposite end a slot 78,

formed therein, which is adapted to receive a pin 79 on the lever 70 and said pin 7 is engaged by the shoulder 80- formed at the end of the slot 78 in said push-rod 177 and the movement of the lever 7 O is thus limited.

When the car is running the parts will be moved into the position shown in Fig. 2. In which position water is exhausted from the cylinder 49, of the actuating device 45, by the preliminary valve 55. This allows the high pressure in the cylinder 48 to move the piston 50 into the cylinder 49 and the push-rod 77 will be held in such a position that the shoulder 80 in the said push-rod will form a stop to limit the movement of the lever 7 O and thus prevent any movement of the piston 32, of the auxiliary valve 20, by the action ofthe high pressure in the chamber 35, of said latter valve, acting upon the larger head 33 of the piston 32, The

said piston 32 will thus be held in a position which will shut off the flow of water the arms 62 and 63 of the cam member 46,-

to move the latter upon the pivot shaft 56 and throw the cam member 46 out of the path of the projections on the flexible member, so that the latter may run free when the car is being raised or lowered by the controlling valve.

The preliminary valve 55, for controlling the actuating device consists of the cylinder 86, having the piston 87 slidably mounted in a sleeve 91 secured in said cylinder. The said piston is provided with heads 88 and 89 and the space between said heads forms a chamber 90 which is constantly supplied with water from the high pressure pipe 21. p

A pipe 92 connects the chamber 94 of the pressure pipe 21 will be admitted through the. preliminary valve 55 to the pipe 92 communicating with the cylinder 49 of the actuating device 45, which will move the piston of the actuating device into the position shown in Fig. 3, due to the fact that the end of the piston 50 in the cylinder 49 is larger in diameter than the end in the cylinder 48. I r

The piston 87, of the preliminary valve .55, is connected withan arm 95 pivotally mounted at one end on the shaft 96, Fig. 1, and the free end of said arm 95 is provided with a roller 97 which is engaged by a sliding cam 98 operated by the connection 17 of the controlling valve 10.

When the controlling valve 10 is set to supply pressure to or exhaust the pressure from the plunger cylinder 3 through the to-and-from pipe 12 to raise or lower the car, the cam 98 will assume the position shown in Fig. 2, which will move the piston of the preliminary valve so thatthe water will be exhausted from the cylinder 49 of the actuating device 45, which will allow the piston 50, of the latter, to move into the position shown in Fig. 2, which will cause the cam member 46 to be withdrawn from the path of the projections upon the flexible member 22 and permit said projections and said flexible member to run free. p I

When the controlling valve 10 is closed to stop the car the cam 98 will be moved by the actuating means of said. controlling valve 10 and said cam will move the piston 87 ot the preliminary valve 55 into the position shown in Figs. 1, 3 and 4, in which position the high pressure will flow from the high pressure pipe 21 through the preliminary valve 55 and through the pipe 92 into the cylinder 49 of the actuating device 45 and movethe piston 50, of the latter valve, toward the cylinder 48 of said actuthe am member 46 into the path of the prothe flexible member 22, corresponding to the floor level at which the car is stopped, and hold the auxiliary valve 20 closed.

When the parts are in the last above decribed positions, see Fig. 1, the plston 50, of the actuating device 45, Wlll be forced against the head of the cylinder 48. The shoulder 80 formed at the end of the slot 78 in the push-rod 77, will be drawn away from the pin 7 9 on the lever 70. The cam member 46 will take against the pro ection on the flexible member 22 and the connecting rod 65 will hold the lever 70 from moving by the action of the pressure on the piston 32 in the auxiliary valve 20 and said piston 32 will be held in a position to close the port holes 38 in the auxiliary valve 20 so that no water can flow to or from the plunger cylinder 3 and as the controlling valve 10 is closed the car will remain stationary.

Should the controlling valve leak and allow the car to settle the flexible member 22 will move the projection 28 away from the cam member 46 and the latter will move into the position shown in Fig. '3, and the pressure in the auxiliary valve 20 will act against the larger end of the piston 32 and force it against the head 43, of the auxiliary valve 20, and open the port holes 38, which will permit the water from the high pressure pipe 21 to flow through the auxiliary valve 20 into the plunger cylinder 3 and raise the car. This latter movement of the piston 32 of the auxiliary valve 20 is permitted by the fact that there is no projection upon the flexible member 22 at the normal point to form a stop for the cam member 46 and therefore the high pressure in the auxiliary valve 20 may move the piston 32, which in turn moves the lever 7 0 into the osition shown in Fig. 3, as the in 7 9 on sa1d lever does not strike the shou der 80 in the pushrod 77 and the connecting rod 65 may move because the cam member 46 does not take against any projection upon the flexible member 22. When the parts are in this position, as shown in Fig. 3, the water will continue to flow from the high pressure pipe 21 through the auxiliary valve 20 into the plunger cylinder 3 and the car will rise until it reaches the floor level, at which point a proj ection upon the flexible member 22 will take against the cam member 46 and force it into the position shown in Fig. 1, which will close the auxiliary valve 20, by the action of the cam member 46, which moves the piston aaeaeae raise the car until the next projection on the flexible 'member will take against the cam member 46 and shift it into a position, as shown in Fig. 1, to close the auxiliary valve and bring the car to rest at the next floor level above the place in which the car was when the controlling valve was closed.

T1. the controlling valve 10 should leak and allow the car to rise above the floor level the flexible member will move the projection thereon from the normal point, as shown in Fig. 1, into the position shown inFig. 4. An upward movement of the car of one 1nch above the floor level will be suflicient to cause the projection 28 on the flexible member to move the cam member 46, which by means of the connecting rod 65 and the lever 70 will shift the piston 32 of the auxiliary valve 20 into the position shown in Fig. 4, with the port holes 38 in the auxiliary valve 20 open which will allow the water to flow from the plunger cylinder 3 into the exhaust pipe 41 and cause the car to descend. As the car descends the projection 28 on the flexible member will be moved back to the normal point and allow the cam member 46 to assume the position shown in Fig. 1 the auxiliary valve 20 will be closed and the car will be brought to rest at the floor level.

Ifthe controlling valve 10 is closed and the car stopped within fourteen inches above the floor level, or within the distance that the flexible member may move the projection 28 without moving it free of the cam member 46, the auxiliary valve 20 will be held open, as last above described, and as shown in Fig. 4, in which position the auxiliary valve will exhaust the water from the plunger cylinder 3 and cause the car to descend until the projection 28 on the flexible member reaches the normal point, when the auxiliary valve 20 will be closed and the car brought to rest at the floor level.

It will be seen that when the controlling valve 10 is open, to raise or lower the car, the cam member 46 will be moved free of the projections 28 on the flexible member 22 and the auxiliary valve 20 will be closed. When the controlling valve 10 is closed to stop the car the cam member 46 will be moved against a projection 28 on the flexiin which position ble member or into the path of the same. i

mal point, Fig. 1, and the auxiliary valve will remain closed. Should the car be stopped below the floor level by the closing of the controlling valve 10 or by the leaking of the valves the cam member 46 will assume the position shown in Fig. 3 and shift the auxiliary valve 20 to allow water to fiow into the plunger cylinder and raise the car to the floor level, when the projection on the flexible member and the cam member 46 will'be moved into the normal position and the auxiliary valve will be again closed.

If the car should be stopped a short distance above the fioor level by the closing of the controlling valve or the car raised by the leaking of the valves, the cam member 46 will assume the position shown in Fig. 4, with the auxiliary valve 20 open to exhaust the water from the plunger cylinder and the car will be brought back to the floor level and the parts again brought to the normal positions with the auxiliary valve closed.

If the controlling valve 10 is closed when the car is more than fourteen inches above the floor level the cam member 46 will assume the position shown in Fig. 3, and the auxiliary valve 20 will allow the water to flow from the high pressure pipe 21 into the plunger cylinder 3 and raise the car until it reaches the next above floor level at which point the projection on the flexible member will take against the cam member and shift the parts into the normal position, as shown in Fi 1, with the auxiliary valve20 closed and t e car brought to rest at the fioor level.

Having thus described my invention I claim and desire to secure by Letters Patent:

1. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, a piston in the auxiliary valve for controlling the latter valve, a high pressure chamber formed in the auxi iary valve tending to move the piston in one direction, an

actuating device for controlling the said piston against the action of the high pressure in the auxiliary valve, a cam member pivotally mounted upon the actuating device, a member controlled by the position of the car adapted to govern the movement of said cam member, and a preliminary valve I for controlling the actuating device whereby the said cam member is moved into and out of the path of the said member controlled by the position of the car.

2. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, an actuating device, a iston in the actuating device, a cam mem er pivotally mounted means for connecting the piston of the aux iliary valve with the actuating device to operate the piston of the auxiliary valve.

3. An elevator comprising in its construc tion a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, an actuatin device, a sliding piston in the actuating evice, said iston having heads of dift'erent areas, cylin ers in which the heads of said piston are mounted, pipes connected with said cylinders to admit pressure thereto, a cam member actuated by the said piston, a member coupled with the car to govcm the movement of the cam member, a piston in the auxiliary valve and means for connecting the actuating device with the piston of the auxiliary valve to control the latter piston.

4. An elevator comprising in its construc tiona car, a hydraulic motor therefor, a controlling valve for controllin the motor, an auxiliary valve for controlling the motor, an actuating device for controlling the auxiliary valve, a sliding piston in the actuating device, said piston having heads of different diameters, cylinders containing the said piston heads, pipes to admit high pres sure to said cylinders to move the piston in one direction, a cam mounted upon the piston of the actuating device, a member coupled with the car to limit the movement of the cam member, and means for relieving the pressure from the larger one of the cylinders of the actuating device to move the piston therein in the opposite direction and thereby move the cam member out of the ed upon the piston of the actuating device,

a member coupled with the car to govern the movement of the cam member, and means actuated by the controllin valve to admit ressure to the cylinders o the actuating evice to move the piston therein in one direction and to exhaust the pressure from the larger one of the said cylinders and thereby chan e the position of the cam member in relation to the said member coupled with the car.

6. An elevator comprising in its construc tion a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an

auxiliary valve for controlling the motor, an actuating device for controlling the auxiliary valve, a sliding piston in t e actuating device, said piston having heads of different diameters, cylinders to receive the piston heads, a cam member mounted upon the said piston, a member coupled with the car to limit the movement of the cam member, a pipe connected with the smaller cylinder of the actuating device to admit pressure thereto to move the cam member out of the path of the member coupled with the car, a preliminary valve operated by the controlling valve, and a pipe connecting the prellminary valve with the larger cylinder of the actuating device to admit pressure thereto thereby moving the piston therein in the opposite direction and the cam member into the path of the member coupled with the car.

7. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, 'a piston in the auxiliary valve for operatlng the valve, a high pressure chamber formed in the auxiliary valve tending to move the piston in one direction, an actuating device, a sliding piston in the actuating devlce, a cam member pivotally mounted upon the piston of the actuating device, a member coupled with the car to govern the movement of the cam member, and connecting means between the actuating device and the piston of the auxiliary valve whereby the position of the cam member will actuate thepiston of the auxiliary valve against the high pressure in the said auxiliary valve.

8. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, a piston in the auxiliary valve for operating the latter valve, a high pressure chamber formed in the auxiliary valve tending to move the piston in one direction, an actuating device, a sliding piston in the actuating device, a cam member pivotally mounted upon the piston of the actuating device, a member coupled with the car to govern the movement of the cam member, cylinders of different diameters in which the piston of the actuating device is mounted tending to move the piston therein in one direction when high pressure is admitted to said cylinders, and a lever connecting the piston of the auxiliary valve with the cam member whereby the piston of the auxiliary valve will move the cam member into the path of the said member coupled with the car when the controlling valve is in a position to stop the car and high pressure is admitted to both cylinders of the actuating device.

9.. An elevator comprising in its construction a car', a hydraulic motor therefor, a con tro Ir valve for controlling the motor, an

naeneea auxiliary valve for controlling the motor, a

piston in the auxiliary valve for operatin the latter valve, an actuating device, a sli ing piston in the actuating device, acam member pivotally mounted upon the last mentioned piston, a lever ivoted in a fixed bearing, a connecting rod etween said lever and the piston of the auxiliary Valve, a connecting rod between the said lever and the cam member, a stop to limit the movement of the said lever,-said stop controlled by the piston of the actuating device, and a member controlled by the position of the car to govern the movement of the cam member.

10. An elevator comprisingin its construction a car, a hydraulic motor therefor,

a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, a piston in the auxiliary valve for operating the latter, said auxiliary valve having a high pressure chamber formed therein to normally move said pistonin one direction, an actuating device, a sliding iston in the actuating device, a cam mem er pivoted upon the piston of the actuating device, a bell-crank lever pivotally mounted in a fixed bearing, onearm of the bell-crank lever connected with the piston of the am:- iliary valve, a rod having one end connected with the piston of the actuatin device, said rod slidably connected with t e bell-crank lever to form a stop and hold the piston of the auxiliary valve against the action of the pressure in the auxiliary valve, and a member coupled with the car to govern the movement of the said cam member.

11. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the mo tor, an auxiliary valve for controlling the motor, a piston in the auxiliary valve for operating the latter valve, a member coupled with the car, a projection upon the latter member, a cam member adapted to be engaged by the said projection upon the member coupled with the car, said cam member consisting of two parallel plates, an actuating device upon which said cam member is pivotally mounted, and means for connecting the cam member with the piston of the auxiliary valve to move the car independently of the controlling valve.

12. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the m0- tor, an auxiliary valve for controlling the motor, apiston in the auxiliary valve for operating the latter valve, a member coupled with the car, a projection upon the latter member, a sheave around which saiddevice, a piston in the actuating device upon which said cam member is pivotally mounted, and means for connecting the cam member with the piston of the auxiliary valve to move the car independently of the controlling valve.

13. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, a piston in the auxiliary valve for operating the latter valve, a counter-balance weight, a flexible member connected with the car and the counter-balance Weight, an actuating device, a cam member upon the actuating device adapted to be engaged by the flexible member, and means for connecting the actuating device with the piston of the auxiliary valve to operate the car independently of the controlling valve.

14. An elevator comprising in its construction a car, a hydraulic motor therefor, a controlling valve for controlling the motor, an auxiliary valve for controlling the motor, a piston in the auxiliary valve for operating the latter valve, a counter-balance Weight, a flexible member connected with the car and the counter-balance weight, a sheave mounted in a fixed bearing, a sheave mounted in a movable bearing, said flexible member passing around said sheaves, an actuating device, a cam member upon the actuating device controlled by the said flexible member, and means for connecting the actuating device with the piston of the auxiliary valve to operate the car independently of the controlling valve.

15. An elevator comprising in its con struction, a car, a hydraulic motor therefor, a controlling valve for controlling the m0- tor, an auxiliary valve for controlling the motor, a piston in the auxiliary valve for operating the latter valve, a high pressure chamber in the auxiliary valve to move the piston therein in one direction, an actuating device, connected with the piston of the auxiliary valve, a piston in the actuating device, a cam mem er fulcrumed upon the piston of the actuating device, a flexible member to engage the cam member, a preliminary valve to control the piston of the actuating device to move the cam member into or out of the path of the flexible member, projections upon the flexible member for moving the cam member to actuate the auxiliary valve, and means for operating the preliminary valve by the action of the controlling valve.

In testimony whereof I aflix my signature in the presence of two witnesses.

ISAAC B. BITTER. Witnesses:

HENRY KOBICZEK, MARTHA H. QUINN. 

